feat: add location intelligence engine and E2E simulation script

backend/src/modules/tariff/tariff.engine.ts

@@ -5,6 +5,7 @@ export interface QuoteInput {
   durationMin: number;
   waitingMin?: number;
   at?: Date; // لحظة الحساب (لاختيار النافذة الزمنية)
+  geofenceMultiplier?: number;
 }
 
 export interface QuoteBreakdown {
@@ -58,9 +59,13 @@ export class TariffEngine {
 
     const surgeMultiplier =
       def.surge?.enabled && def.surge.multiplier ? def.surge.multiplier : 1;
-    let total = subtotal * surgeMultiplier;
 
-    if (def.min_fare && total < def.min_fare) total = def.min_fare;
+    const geofenceMultiplier = input.geofenceMultiplier ?? 1.0;
+    const finalMultiplier = surgeMultiplier * geofenceMultiplier;
+
+    subtotal *= finalMultiplier;
+
+    let total = Math.max(def.min_fare ?? 0, subtotal);
     total = TariffEngine.round(total, def.rounding);
 
     return {